Drill-bit-retaining device.



'inn' the same modification in pn'rrn sans oirib,

RUDOLPH S. WEINER, OF EL PASO, TEXA@ ASSIG-NOIR. T SULLIVAN MACHINERY COMPANY, 0F CLAREMONT, NEW HAIVIPSHIRE, A CORPORATON 0F MASSACHU- SETTS.

DlitLL-BIT-RETAINING DEVICE.

Mensen.,

Specification of Letters Patent.

raient-ea nee. ii, isis,

To all 'whom t may concern:

Be it known that l, RUDOLPH S. WEINER,

a citizen of the United States, and a resident of El Paso, county' of El Paso, State of Texas, (whose post-office address is El Paso, Texas have invented an Improvement in Drill-Bit--Retaining Devices, of which the. following description, in connection with the accompanying drawings, is a/specification, like characters on the drawings representing like parts.'

This invention relates to drill bit reta-ining devices for drills of the hammer type, af'nd more particularly, though not exclusively, to such devices as apply to liuid pressure tools of th(l pistou hammer type in which the drill bit is struck a hammer blow tending to drive it out of the drill chuck when the bit is not restingl against its work.

The invention will be best understood by reference to the following description when taken in connection with the accompanying illustration of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

ln the drawings: Figure l is a plan partly in central, longitudinal section showing the forward end of a pressure-fluid rock drill of the piston hammer type to which there is applied one form of the invention; Fig. 2 is a side elevation Aof the parts represented in Fig. l; Fig. 3 is a view similar to Fig. 1 showing a. modified form oi the invention; and Fig. 4 is a` View similar to Fig. 2 show- ,side elevation.

Referring to the drawings bodiment of the invention selcictcd for illustration, l have there shown af fluid-pressure rock drill of the piston hammer type having a cylinder l in which operates the piston 2 having the reduced forward extension 3 constituting a hammer adapted to deliver blows upon the inner end or head 4 of the drill bit 5. The drill bit head 4 is loosely held in the drill chuck 6 so as to 'have free, longitudinal movement therein, but is preferably of noncircula r cross section conforming to the noncircular cross section of the chuck so as to be non-rotatable with relation thereto. The chuck is herein rotatably mounted' in an elongated front cylinder head Y, preferably supported in a yielding manner at the fornd to the em'- ward end of the cylinder. T o this end the cylinder head is provided with laterally projecting lugs 8 through which extend a pair of tie rods 9. The rear ends of these rods extend through the lugs 8 and are secured to the rear end of the cylinder or to the rear cylinder head (not shown) in the usual manner. The forward portions of the rods are encircled by cushioning springs 10 interposed between the lugs 8 and suitable abutments carried by the rods, such as the nuts 11 threaded on to their front ends.- The arrangement is such that the front cylinder head is yieldingly mounted on the cylinder so as to cushion the blow of the piston should the latter strike the head or the parts sustained thereby.

rlhe parts so far described are of usual, conventional construction and require no further description. y

liteferrinar now more specifically to the novel features ofthe invention, the drill bit 5 is provided with an enlarged portion or abutment l2 between the shanl' or main portion of the bit and the head fi. This enlargement isshouldered to engage the forward end of the drill chuck andl limit the inward movement of the drill bit as it rebounds after being struck by the piston hammer. it also serves in coperation with a stop orretaining device both to arrest the forward movement of the drill bit when struck by the piston hammer and to cause the drill bit to be withdrawn with the tool from the work if it has any tendencyto stick in the drill hole. To this end there is provided a retaining or stopping device in the form of a. chain 13 orvother flexible member adapted to engage' the drill bit shank as by encircling the same in front of the enlargement l2 and adapted to have its .ends attached to some part of the drill.

Preferably1 as herein, the ends of the iiexif ble retaining member are .attached to the forwardcylinder head and preferably also 4thejware secured thereto b v some kind 'of a "yielding attachment. Herein, for such purpose the opposite ends oit the chain'are each attached toan eve ll formed in the forward end of a link l5. theopposite end of the link being shaped in the form of a sleeve `16 which cnciicles the tie rod 9 between the lug' 8 and the cushioning spring l0. Any

has heed inseilee 'through e wise or hitch in ille loop, ning' one or more Coils 19 therefnni., Soim when whe drill hia is in place lie coil may he slipped down. lno Sonie such 'ne/simone@ represented :ind may he drawn in l in if l". rin of 'za tighi hiaeh about the sh The -loop also is of such is 'he hich sniiicienly i, largement 12 o pievent the drill @idents-Hy withdrawing from '.f ie lnin'nne f-slrikes @he d ill lii'l; Wilnhdmwn from the drive the loi forward, or drill hole when the from 'he Work1 the il or'wfird until it strilnifs h lhly gripped by the Jard xnoif'einen is preo :irlionfe merely n' the sini al( still nd., lie drill shanlc by he operative hy Al 'l l shipping die mitch up the shaun loich, wheiea `lhe coil lil muy' he ed 'to allow thewithdrawal of 'fge'lnen'i in lhe drill hi head .it will he Seen that the forward. niovemen of drili hit, which his 1 i. I l. I l; L iw oei-.flee nl designed. Le l n.. ende to tighten initiates the hitch about the Slank and hieca opposite of the Conditions required relemsing the d il bit. ,l41 nrthurmore. in

'he em of :i hold-@ of he chain yie, the linke ol' Ehe main when engaged hy the einergernent l2 exet n #flipping or pinching' aicion which effectively arrests :my enflency of the shank to slip through the hitch.

In operation the springs l0 serve to cushion the cylinder head should the piston strike the same, and they also serve to enshon the stopping or retaining effect of the hitch or coil 19 on the abutment l2 when the liter is driven forward hy the piston. st'rihing" the drill hit head with the drill hit 1 moved :from the work.

in Figs. 2 and 3 im@ Shown zi. modified forni of the inventiliin wherein for the eniizi 13 l have subst-inlaid :i short seion 2O of wire rope or cable. The end of the Cable is`f0rn1ed into :in eye 21 which is secured lo the eye 22 formed in :L hw" on the side of the sleeve 23. the letter eneii'oling nhe side hill Compl rod 9 between lLhe lng El and tho cushioning; spring 10. The sleeve is Carried down ail, 2i' to forni :ui inrlosing borrel :ihoul ilul spring. At the forwird end oi lho cylinder hemd the loop nienililr :ill is profvrzihlv guided through :in eye in thv lng :5 projevl ing' from the side oi the head. 'l'hi' mhhl meniher '.fll nrovide :i loop whin-h is nsvd in the sinne iviiy :is has been desvrihed \\'ilh reference to the chain nnnher 1;. lolh (Inl cnhle 2l) :and Chain l2 Forni lig'ziinros hot von the hit' :ind (he machin@ that might'. ho di scrihed :is nnicnhir, than' the); huw the iinxhvrness of :i Cord :ind do not have :my linherent shape suon ns :i hzlr ol nnzli or the like would have. ll. is ohvioii` ihzii Ilexi 'hie re mining; nieinhors o' otlwr loi-nn: und

sevnrvd to the drilling!A nnnhiin` in other Ways than those herein indin'iiled muy hv vmplayed.

While l have herein shown :ind dwrrihvd one rsiiieeiic embodiment oiA the inwnlion l'or il'lllsjrziire iinriiosnn und huw din-low! :md disCner-Jed in (lr-mil he vonnlrnwiion :ind :1rranifrenient. incidenlol io one .win-iin umilil'aliizn, hlil'wf, it is lo ho innhr:-1m nl [hill lghe invention is noL liiniell to ihc dvinih: or rehiiive nrrzingenienl` of parte nor lo lh(- Siecilic embodiment hervin shown, hui' 111:11, extenssiw divintionn from the illustrated lorin of ihe invention muy he lad withoni` departing from the principles hervo'.

Claims 1 l. ln :i hznzfnner drilh the eonihinntion Said side rods living; provided with end iihninninls, eufshimingg; Springe intel@ posed heween the lugs z nd the :iliutmenls on the Side rods;`r :i piston hanmner, :i drill clinch, :i drill hit adapted to vhere longitndinul morenien in sziid clinch and hnriig :zn :ihnnienl or enlargement in 'from'. ol' .he ohneli', and :i retaining' device ior will drill sing n flex' .le chain :idiililied to he wrapped mi hib hiicheil uhont the drill in lron; of Suid :ihntinen' :ind lo have ile endg Secured to Such. drilling: machine. menne for securing the ends of the chain to the drilling machine consislingof links having` euch :in eye at', one end engaging the end of the chain,4 a. sleeve member :it the opposite end interposed between :i cushioning; Spring: ond n cylinder head lng upon n., side rod, :ind means upon the cylinder head `For guiding; the forward end of ezieh link. i y

ln :illuminer drill, ihe combination with zi. cylinder. :i liront hend, han* provision to receive ne ujy'limler Side rods, side rodser clamping; @he freni? heini. inilo posh tieni, cushioning :springs Qiicireling` the Side rode and interposed heween end :ilmtnnfiilis thereon und the front hond, :i iiison hninnier? :i drill elineli7 :i drill his. ingf h" jitudinal movement of said chuck and provided with an enlargement in front ofv said chuck, and a retaining device for said drill bit Comprising a flexible member' adapted to be Wrapped'about the shank ot' the bit in lront of said'abutment, and slidable sleeves mounted -upon the side rods between the cushioning springs and the cylinder head to which the ends of the flexible member are secured.

3. ln a hammer drill, the combination with a cylinder having a front h'ead with side rods and cushioning springs, a drill bit adapted to have longitudinal movement'in the front head, and pro-vided with an lenlargement or abutment, a drill bit retaining` device comprising a flexible member adapted to be Wrapped about said bit in front of said enlargement, and means interposed between the cushioning' springs and the cylinder head for vieldably fastening the ends of said llexible member. Y

al. ln hammer drill, the combination with a cylinder, a chuck, a drill bit loosely held in said chuck for longitudinal movement, said drill bit having an enlargement and a flexible retaining member having its ends each secured to the drilling machine and having its intermediate portion 'forming' ay loop adapted to be wrapped about the Shank of saiddrill in front of said abutment and to prevent the escape of the drill from. the drilling machine.

Inf a hammer drill, the combination with a jcylindei, a chuck, a drill bit loosely held iii said chuck for longitudinal movement, said drill bit having an enlargement and a `flexible retaining member hating its ends yieldably secured to the drilling' machine and having' its intermediate portion forming a loop adapted to be wrapped about the shank of said drill in front of said abutment and to prevent the escape oi thevdrill from the drilling; machine.

G. .ln a hammer drill, the combination with a cylinder, a chuck, a drill bit loosel)7 held for longitudinal movement in said chuck, said bit having' an enlarged portion and a flexible. retaining device comprising a member adapted to be wrapped about the drill bit shank in front of said enlarged portion, and means for securing its ends to'the drilling machine.

7. ln a hammer drill, the combination with a cylinder having drill bit holding means in which the' bit is capable of longitu- 'dinal movement, a drill bit having an enlargement and a flexible holder having its ends attached to the drilling machine and having its intermediate portion. forming a loop of sutlicient length to be hitched about the shank of the bit and hold the same ,against escape.

8. ln a hammer drill, the combination with a cylinder having drill bit holding means'in `which the bit is capable of longitudinal movement, drill bit having' an enlargement anda flexible holder having its ends vieldablir attached to the drilling machine and having its intermediate portion lorn'iing a loop of sutllcient length to be hitched about the shank of the bit and hold the same against escape.

9. lnl a hammer drill, the combination with a cylinder, drill bit holding means, a drill bit-longitudinally movable therein and having an enlarged portion, a flexible holding chain adapted to engage the drill bit shank i'n front of said enlarged portion and prevent the escape of the bit from the holding means, and means for fasteningjthe ends ot the holding chain to the drilling machine.

l0. .ln a hammer drill, the combination with a cylinder, drill bit holding means, a

drill bit long'itudi'nall)T movable therein, a funieular holding member adapted to engage directly the drill bit shank, and means tor securing the holding member to the drilling machine.

ll. ln a hannner drill, the combination with a cylinder having a front head with side rods and cushioning springs., a drill bit adapted to have a longitudinal movement in the .Front head, a drill bit retaining device comprising a tenible member adapted to engage the drill bit shank and means interposed between the cushioning springs andv the cylinder head for },'iel lably securing the ends ot said Flexible member.

i l2, ln a hammer drill, the combination with a cylinder drill bit holding means, a drill bit longitudinally movable therein, a flexible holding chain adapted to engage the drill bit shank and prevent the escape of the drill bit holding means, and means for fasloo tenino the ends of the holdin" chain to the drilling machine.

lh ln a hammer drill, the combination with a cylinder', a chuck, a drill bit loosely held for longitudinal movement in said chuck, a flexible retaining device comprising member adapted to be .wrapped about the drill bit shank, and means for securing its ends to the drilling` machine.

ll. ln a. hammer drill, the combination with a cylinder having drill bit holding mea-ns in which the bit is capable of lon itudinal movement, a drill bit and a flexible holder having its ends attached to the drilling machine and having its intermediate portion forming a. loop adapted to engage the shank of the bit and hold the same against escape.

l5. ln a hammer drill, the combination with a cylinder, drill-bit holding; means, a drill bit longitudinally movable therein and a ligature connecting the drill bit Tvith the drilling; machine and havine' a portion adapterl onder tension to constrict about the drill l' .t shank.

ffo grip he fili 'bit shank.

En testimony wherco, l have Slgned my muuu to this specicution, in *ghe 13112501160 of two subsvmhmg wltnesfevs.

RUDOLPH S. VENER.

Wiincscs:

W. ii. Fuum, JEAN BOYD. 

